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(No Model.) Y

J. F. BROWN.

CLAMP FOR EXTENSION GAS FIXTURES. 'No. 256,426. Patented A 'pr. 11, L882;

ATTORNEYS.

'. sponding parts in all the figures.

'of the upper part of the clamp taken on line UNITED STATES PATENT OFFICE. I

JOHN F. BROWN, OF BROOKLYN, ASSIGNOR T0 OXLEY sJ emnI es, OF

I NEW YORK, N. Y.

C LAMP FOR EXTENSION GAS-FIXTURESD I SPECIFICATION forming part of Letters Patent No. 256,426, dated April 11,-1882.

Application filed January 3, 1882. (NomodeL) To all whom it may concern Be it known that I, JOHN F. BROWN, of Brooklyn, Kings county, New York, have invented a new and useful Improvement in Clamps for Extension Gas-Fixtures, of whichthe following is a full, clear, and exact description.

My improvements relate to clamping devices used on extension gas-fixtures or drop-lights; and the invention consists in a friction-dog of novel construction and arrangement, as here-v inafter described and claimet Reference is to be had to the accompanying drawings, forming part of this specification, in which similar letters of reference indicate corre- Figure 1 is a vertical central section of my improved clamp. Fig. 2 is a plan View of the revolving disk. Fig. 3 is an inverted section :0 0c of Fig. 1. Figs. 4 and 5 are face views of the holding-disk. Fig. 6 shows theclampingdog separately. 7

A is a circular. case apertured at top and bottom for the slide rod and formed with a screw collar, (1, for its attachment to the fixture.

B is a circular disk, in the upper part ofcase A, formed with a central aperture, b,-of angular form, and provided on its under side with a circular flange or hub, c, which is slatted at one side, as shown at c in Fig. 3.

G is a circular disk taking against hub c of disk B and formed at its upper side with an annular flange, cl, the inner surface Of which is preferably roughened or formed with ratchetteeth. (See Fig. 4.) To the under side of disk 0 (see Fig. 5) spring-arms 6 cc are attached, and their free ends take against the inner surface of case A, the springs being of sufficient strength so that their friction on the case shall hold the weight of the drop-light. The bottom cap, k, retains the parts in the case. Thedisk O has a central aperture, in which is a short tube, 6, that is held between flanges on cap 7: and disk B, so as to retain the parts central.

D is the friction-dog, the same beinga loose block between the two disks, having lugs ff to retain it on the flange d of disk U-aud'bind thereon, and with a side lug, 9, that enters the slot of flange c on disk B. On disk B (see Fig. 3) is astud, h, against which the'dog takes to limit its movement in that direction, and the stud is slotted to receive the flange d and aid the clamping action.

The slide rod E passes through the case and the apertures of disks B O, and the rod being formed with spiral ribs engages the angles of the aperture b in disk B, so that the disk B is revolved by endwise movement of rod E. By the upward movement of the rod the disk B is turned in the direction to carry the stud h against the dog, and the latter moves'over the flange of disk 0 without any clamping action;

but on the reverse movement the dog is car-- ried by its connection to hub 0 against the flange d of disk 0, so that its lugs f'clamp thereon, and the disk B cannot turn without carrying the friction-disk G. The friction of springs e is sufficient to hold the weight of the drop-light.

The action of the clam p is noiseless, and there are no parts liable to get out of order.

I an; aware that a friction-clamp working in ribs is caused to slide is not broadly new, and I am also aware that drop-lights have been supported by the frictional contact of springs on the inner surface of the casing, and therefore do not claim such; but 7 What I do claim, and desire to secure by Letters Patent, is-- l. The clamp for drop-lights, consisting of apertured disk B, provided with slatted hub c and stud h, disk 0, having flange 0?, springarms e, and dog D, provided with lugs f 9, substantially as shown and described, combined with case A, for operation as specified.

2. In clamps for drop-lights, the loose clampacasing wherein a rod provided with spiral ing-dog D, in combination with the revolving disk B and friction-disk O, substantially as Witnesses GEO. D. WALKER, O. SEDGWIOK. 

